import logging
from logging.handlers import RotatingFileHandler

from flask import g
from flask import render_template
from flask.ext.wtf.csrf import generate_csrf

from config import config
from flask.ext.wtf import CSRFProtect
from flask_sqlalchemy import SQLAlchemy
from flask_session import Session
from flask import Flask
from redis import StrictRedis



db = SQLAlchemy()
redis_store = None # type:StrictRedis

def set_log(config_name):
    # 设置日志的记录等级
    logging.basicConfig(level=config[config_name].LOG_LEVEL)  # 调试debug级
    # 创建日志记录器，指明日志保存的路径、每个日志文件的最大大小、保存的日志文件个数上限
    file_log_handler = RotatingFileHandler("logs/log", maxBytes=1024 * 1024 * 100, backupCount=10)
    # 创建日志记录的格式 日志等级 输入日志信息的文件名 行数 日志信息
    formatter = logging.Formatter('%(levelname)s %(filename)s:%(lineno)d %(message)s')
    # 为刚创建的日志记录器设置日志记录格式
    file_log_handler.setFormatter(formatter)
    # 为全局的日志工具对象（flask app使用的）添加日志记录器
    logging.getLogger().addHandler(file_log_handler)

def create_app(config_name):
    app = Flask(__name__)
    app.config.from_object(config[config_name])
    set_log(config_name)
    db.init_app(app)
    global redis_store
    redis_store = StrictRedis(host=config[config_name].REDIS_HOST, port=config[config_name].REDIS_PORT)
    CSRFProtect(app)#开启当前项目CSRF保护，只做服务器验证功能


    @app.after_request
    def after_request(response):
        # 调用函数生成 csrf_token
        csrf_token = generate_csrf()
        # 通过 cookie 将值传给前端
        response.set_cookie("csrf_token", csrf_token)
        return response
    #设置Session保存位置
    Session(app)


    from info.utils.common import user_login_data
    @app.errorhandler(404)
    @user_login_data
    def page_not_found(_):
        user = g.user
        data = {"user_info": user.to_dict() if user else None}
        return render_template('news/404.html', data=data)

    from info.modules.index import index_blu
    app.register_blueprint(index_blu)

    from info.modules.passport import passport_blu
    app.register_blueprint(passport_blu)

    from info.utils.common import do_index_class
    app.add_template_filter(do_index_class, "index_class")

    from info.modules.news import news_blu
    app.register_blueprint(news_blu)

    from info.modules.profile import profile_blu
    app.register_blueprint(profile_blu)

    from info.modules.admin import admin_blu
    app.register_blueprint(admin_blu)



    return app
